Drum-brake.



w. s, HUTCHINSON.

DRUM BRAKE.

APPLICATION HLED JAN-15.1915- 2,1 1L, PatentedSept. 7, 1915.

2 SHEETSSHEET 1.

S- HUTC'HINSON.

DRUM BRAKE.

APPLICATION FILED JAN. 15. 1915.

EET 2.

Sept.

Patented 2 SHEE maasi WILLIAM sanronn HU' IiCHINSO-I N, onoysrEn-BAY, N W YORK.

To all whom it may concern:

Be it known that INSON, a citizen of the United States, and a resident of Oyster Bay, York, have-invented a p'rovement in Drum-Brakes, of which the Nassau county, New

I following is a full, clear, and exact description.

My invention relates to improvements in drum brakes such as are peculiarly adapted for use. on automobiles, although the brake may be used on other vehicles or for other purposes.

The object of my invention is to produce a simple, powerful,

durable,

( style of drum brake inwhich a shoeor shoes is or are arranged within a drum, and forced into contact with, the-inner rim of the drum.

I prefer-to apply my'invention toa drum of this kind having a spring shoe extending substantially around *the inner surf-ace of the 'drnm rim, and when the shoe is expandedit engages the rim of the drum, and when. contracted it leaves the drum clear.

shoe, I employ stationary'blo'cks supported within the drum, rim and shoe, and guiding devices operating in connection with the blocks and serving to force the shoe with great -power against the rimof' the drum, M while such devices permit the shoe to be easilyreleased and contracted. r Reference istobe had to the accompany ing drawingsforming apart ofthis specification, in which similar reference characters indicate corresponding parts in all the VIGWS.

j my improved, brake, as applied to the hub" still another modification of the I To illustrate the application of my inven- W.

I modified guiding and actuating Figurel is a cross-section of a drum and aiid axle of an automobile. Fig. 2 is a cross section on the *linef22 of Fig. 1, showing the guiding devices in detail. Fig. 3 is a View similar to Fig. 2 but showingslightly devices, and Fig. 4 is a yiew-similar to Fig. 3 but showing invention.

tion I have shown a drum 10 which isof substantially-the usual type and which .is applied to the liubll of anautomobile Wheel,

which is connected as usual with an axle 12.

@bviously the-particular style of the drum is not material. I prefer to .use the single shoe 13 of spring material, which is an I, WILLIAM S. Huron new and useful Im In connection with means for expanding the DRUM-BRAKE. i

- Specification of IlLetters Patent;

and easily. controlled drum brake 3 My'invention relates particularly to that.

- Patented se ta, iaia.

App1ication filed January 15, 1915. Serial No. 2,304.

ranged within the drum rim and concentric on the inner side. When a single shoe is used I prefer to conr'iect the endsby an extenslble spring15.

it in contactwith the drum rim, andI do not limit the invention to any particular device of this kind. I have shown a means whichI do not here claim, comprising a bent arm 16 which is pivoted to one end of the shoe 13, and is connected pivotally by means of a link 17 with the opposite shoe end, the

link being pivoted at the bend of the arm,

and the arm 16 has its inner end connected the shoe 13'may-be expanded orccontracted.

' which are fast to the shoe is expanded-so as to can be locked tight to the drum 10. It will 1 Means has to be provided to guide the shoe 13. and to force it with sufficient power against the'drum rim. 'I have illustrated several ways of accomplishing this =result,

and in Fig. 2 I show a series of blocks 24 plate23, while opposite the blocks. are triangularly shaped bosses 25 which are fixed to the shoe and which enter correspondingly shaped notches in'the blocks 24. Consequently when the the drum 10, the bosses 25' will ride upon the inclined walls of the blocks 24, the blocks and walls having a cam action, and the shoe be seen that this construction has the advantage of operating in either direction, that is to say, ,whether the drum. 10

.either forward or backward, the shoe will have the same -frictional contact and the same freedom tolock securely to the drum. It will be evident that many forms of fixed ahutmentswithin the drum and shoe, and

many forms of engaging members for such abutments, can be used and connected to the shoe without afl'ecting the principle of the inve'ntion.- To illustrate this I have shown slight modifications in JFigS. 3 and 4. In

Any suitable means can be used for expanding theshoe so as to put .of the axle 12. Tlie frictionally engage is rotating therewith, this shoeh-aving preferably a stiffen ng nb 14 about centrally thereon and lot . shoe arranged within the'drum and adapted abutment between the -shoe and thedrum Fig. -3 the stationary blocks 26 have their outer surfaces, that is the sides next the shoe 13, crescent shaped, and arms 27 are secured to the shoe, and converge and have a common pivot on the rolling abutment 28 which, rides in the concave side ofthe block 26. Thus when the shoe is expanded, the roller 28 can ride upon the curvediincline of the block 26 and permit the same freedom of movement of the shoe so that it will lock against the drum, while the contraction of the shoe will cause the rollers 28 to ride back to the lowest point of the concavity of the block. In, Figs 4 the same principle is carried out. In-this instance the blocks 29 are secured to the plate 23 or to some other fixed support, While the members' 30 are arranged opposite the blocks andhave semi-circular projections-or bosses'3l fitting corresponding recesses in the blocks 29. The members 30 connect by arms 32 with the shoe 13 to which they are pivoted, and the action is precisely as already described, that is to say, when the shoe is expanded, the rounded projections 31 will ride upon the corresponding parts of the'blocks 29, and when the shoe is contracted they will sink backto their normal position. In each instance it will be observed that thefrictional contact of the shoe with the drum, which is caused in the firsti instance by the brake rod as already explained, will cause the drum and shoe to cohere, and this action is accentuated by the connection between the shoe and the stationary abutment blocks within, the, shoe. As before remarked,it will be evident that the particular form of this connection between the stationary parts within the shoe and the shoe-itself,can be changed without affecting. the principle'of the invention. 3 I claim:

1. A brake comprising arotatable drum, a

to impinge upon the rim of the drum, saidshoe having a limited rotary movement in both directions with the drum, a stationary axis, said abutment having guides'diverging toward the drum rim, and a member connected with the shoe and'in engagement with the guides whereby the movement of the shoe with the drum in either direction forces the shoe against the drum rim.

2. Abrake comprising a rotatable drum having a rim, a shoe concentricallyarranged within the drumand adapted to impinge upon the drum rim, means independent of the setting mechanism for moving the shoe into and out of frictional engagement with the drum rim, a stationary abutment between the shoe and the axisof the drum, fixed guides on the abutment directed to set the shoe against the rim, and members connected to the shoe and arranged to follow the guides on the fixed abutment, whereby the rotation of the drum in either direction will cause the shoe members to follow their guides and set the shoe forcibly against the rim.

3. A brake comprising a rotatable drum, a shoe arranged within the drum, means for moving the shoe toward and away from the drum, a stationary abutment between the shoe and the axis of the drum, said abutment having oppositely inclined guiding surfaces diverging toward the drum, and a member on the shoe following" the guiding surfaces of the'fixed abutment, said guiding surfaces acting to force the shoe outward against the rim whereby the shoe and rim are in frictional' engagement.

4:.- A brake comprising a rotatable drum, an expansibleshoe arranged concentrically within theldrum and adapted to impinge on the drum rim, means for expanding and contracting the shoe, stationaryabutment blocks arranged within the shoe and between the shoe and the axis of the drum, said blocks having guiding surfaces diverging toward the shoe, and members secured to the shoe and constructed to follow the guiding surfaces of the abutment blocks.

WILLIAM SANFORD nurc nnsor.

Witnesses: i

WARREN B. HU'roHINson,

ARTHUR G. DANNELL. 

